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Ogg files can be audio, video, or some complex mixture of the two, but they all seem to have the same signature ("OggS"). If possible, we should try to determine whether and how to differentiate among the different formats, and which MIME types to use as the "sniffed" types. See: http://tools.ietf.org/html/rfc5334
Consensus at the moment seems to be that "application/ogg" is enough. Marking this as WONTFIX for now. (If things change, this can be reopened.)